Objects that derive from RefCounted/RefCountedThreadSafe should not have public dtors.

base/message_pump_default.h

Index: base/message_pump_default.h
diff --git a/base/message_pump_default.h b/base/message_pump_default.h
index c16abcfacd3563447e00423aa97ecd161cdc8cc8..41a436ca89d0bd057e9b8a94a030e3f98db6bb4a 100644
--- a/base/message_pump_default.h
+++ b/base/message_pump_default.h
@@ -15,7 +15,6 @@ namespace base {
 class MessagePumpDefault : public MessagePump {
  public:
   MessagePumpDefault();
-  virtual ~MessagePumpDefault() {}
 
   // MessagePump methods:
   virtual void Run(Delegate* delegate) OVERRIDE;
@@ -23,6 +22,9 @@ class MessagePumpDefault : public MessagePump {
   virtual void ScheduleWork() OVERRIDE;
   virtual void ScheduleDelayedWork(const TimeTicks& delayed_work_time) OVERRIDE;
 
+ protected:
+  virtual ~MessagePumpDefault() {}
+
  private:
   // This flag is set to false when Run should return.
   bool keep_running_;